CVE-2023-4147 | Kernel: netfilter: nf_tables_newrule when adding a rule with nfta_rule_chain_id leads to use-after-free

A use-after-free flaw was found in the Linux kernel’s Netfilter functionality when adding a rule with NFTA_RULE_CHAIN_ID. This flaw allows a local user to crash or escalate their privileges on the system.

Published: 2023-08-07 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2023-4147 is rated Moderate Risk (46.4/100): CVSS High severity, with low exploitation likelihood (EPSS 0.56%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2023-4147

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.16% 0.56% +0.40%
2 2025-11-21 1.09% 0.16% -0.92%
3 2025-11-18 — 1.09% —

Full EPSS history (15 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2023-4147

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.8 3.1 HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.8 5.9 [email protected]
7.8 3.1 HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.8 5.9 [email protected]

Weakness enumeration for CVE-2023-4147

OS Trackers for CVE-2023-4147

vendor priority summary link
debian not yet assigned CVE-2023-4147 not yet assigned priority: Debian including 1 source packages (linux), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2023-4147
redhat high — https://access.redhat.com/security/cve/CVE-2023-4147
suse high — https://www.suse.com/security/cve/CVE-2023-4147/
ubuntu high CVE-2023-4147 high priority: Ubuntu including 167 source packages (linux, linux-allwinner, …), 1873 status rows across 12 suites (bionic, focal, jammy, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): DNE 1428, released 191, not-affected 164, ignored 90. https://ubuntu.com/security/CVE-2023-4147

Affected software / configurations for CVE-2023-4147

Vendor Product Version Raw CPE
linux linux_kernel >= 5.9, < 5.10.190 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 5.11, < 5.15.124 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 5.16, < 6.1.43 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 6.2, < 6.4.8 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel 6.5 cpe:2.3:o:linux:linux_kernel:6.5:rc1:*:*:*:*:*:*
linux linux_kernel 6.5 cpe:2.3:o:linux:linux_kernel:6.5:rc2:*:*:*:*:*:*
linux linux_kernel 6.5 cpe:2.3:o:linux:linux_kernel:6.5:rc3:*:*:*:*:*:*
fedoraproject fedora 38 cpe:2.3:o:fedoraproject:fedora:38:*:*:*:*:*:*:*
redhat enterprise_linux 9.0 cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*
redhat enterprise_linux_eus 9.2 cpe:2.3:o:redhat:enterprise_linux_eus:9.2:*:*:*:*:*:*:*
redhat enterprise_linux_for_real_time 9.0 cpe:2.3:o:redhat:enterprise_linux_for_real_time:9.0:*:*:*:*:*:*:*
redhat enterprise_linux_for_real_time_for_nfv 9.0 cpe:2.3:o:redhat:enterprise_linux_for_real_time_for_nfv:9.0:*:*:*:*:*:*:*
redhat enterprise_linux_server_aus 9.2 cpe:2.3:o:redhat:enterprise_linux_server_aus:9.2:*:*:*:*:*:*:*
debian debian_linux 10.0 cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
debian debian_linux 11.0 cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
debian debian_linux 12.0 cpe:2.3:o:debian:debian_linux:12.0:*:*:*:*:*:*:*

References for CVE-2023-4147

URL Tags
https://access.redhat.com/errata/RHSA-2023:5069 Third Party Advisory
https://access.redhat.com/errata/RHSA-2023:5091 Third Party Advisory
https://access.redhat.com/errata/RHSA-2023:5093 Third Party Advisory
https://access.redhat.com/errata/RHSA-2023:7382 Third Party Advisory
https://access.redhat.com/errata/RHSA-2023:7389 Third Party Advisory
https://access.redhat.com/errata/RHSA-2023:7411 Third Party Advisory
https://access.redhat.com/security/cve/CVE-2023-4147 Patch Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2225239 Issue Tracking Patch Third Party Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0ebc1064e4874d5987722a2ddbc18f94aa53b211 Mailing List Patch
https://www.spinics.net/lists/stable/msg671573.html Mailing List Patch
https://lists.debian.org/debian-lts-announce/2023/10/msg00027.html
https://security.netapp.com/advisory/ntap-20231020-0006/
https://www.debian.org/security/2023/dsa-5480
https://www.debian.org/security/2023/dsa-5492
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